The timing check may be useful for example if the motor is not operating properly (start-up difficulties;
decreased performance and power; difficult or irregular recovery speed etc.); if the failure does not
depend on the carburetion, it may be caused by irregularities of the ignition timing.
Thispossibilityis,however, consideredquite raresince, dueto thecharacteristics ofthe ignitionsystem,
the timing adjustment remains unchanged over time; since the problem arises in most cases from ir-
regularoperationofthecontrolunit, tobesure pleasefollowthe stepsoutlinedon thesideforverification
of the aforementioned device.
If however, after checking the carburetion and the
control unit, the desired improvements are not ob-
tained and there is doubt whether the anomalies
are due to the ignition timing, proceed to check the
latter, operating as follows:.
1) Insert, into the hole (1) a rod of Ø 5 mm.; run the
engine manually until when the end of the rod,
comingintocorrespondencewith theother holeon
the rotor, does not fit.
In this condition the engine is in ignition advance position.
2) Makea mark with whitepainton the fan cover,incorrespondence with the flapof the flywheel bearing
the reference for the timing.
3) Connect a stroboscopic lamp (type TECNOTEST 130/P or other similar) at ignition; the connection
will be made directly on the spark plug or on the H.V. cable, etc. depending on the type of stroboscopic
lamp available and the specific operating instructions. Then start the engine and bring it to about
4000-5000 rpm.
4) The engine will be properly timed to the lamp when the two marks are aligned, or at most, moved to
within a tolerance range of 4° (i.e., within 2° to the right and 2° to the left of alignment position).
5) If the mark of the flywheel rotor is shifted compared to the crankcase more than the allowed tolerance
(or other major irregularities appear during the check), replace the stator or the control unit.
N.B.
FOR VEHICLES OF NEXT PRODUCTION, THE FAN COVER WILL BE FITTED WITH A REFER-
ENCE FOR TIMING, SO THE OPERATIONS DESCRIBED IN POINTS 1 AND 2 WILL NOT BE
NECESSARY.
RULESTO BEFOLLOWED INTHE EVENTOF INTERVENTIONON THEELECTRIC SYSTEM- APE
TM P703 FL2
A) ESSENTIAL WARNINGS
The check or in any case the intervention on the circuits of the devices for the electronic ignition can
be done with relative ease by the electronic repairers of Service Station Workshops; it is essential,
however, that they take observe the notices below, since, in case of failure to observe, they could
irreparably damage the devices.
General guidelines APE TM Benzina
GEN - 10
